(19)
(11) EP 4 451 268 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.11.2024 Bulletin 2024/48

(43) Date of publication A2:
23.10.2024 Bulletin 2024/43

(21) Application number: 24197708.1

(22) Date of filing: 23.07.2013
(51) International Patent Classification (IPC): 
G10L 19/02(2013.01)
G10L 19/08(2013.01)
 G10L 21/038(2013.01)
(52) Cooperative Patent Classification (CPC):
G10L 19/02; G10L 19/08; G10L 21/038
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 29.01.2013 CN 201310034240

(62) Application number of the earlier application in accordance with Art. 76 EPC:
20181460.5 / 3764354
13873587.3 / 2940685

(71) Applicants:
  • Crystal Clear Codec, LLC
    Houston, TX 77002 (US)

    AL AT BE BG CH CY CZ DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR 
  • Crystal Clear Codec spólka z o.o.
    00-499 Warsaw (PL)

    DE 

(72) Inventors:
  • LIU, Zexin
    Guangdong, 518129 (CN)
  • MIAO, Lei
    Guangdong, 518129 (CN)
  • Qi, Fengyan
    Guangdong, 518129 (CN)

(74) Representative: Bosch Jehle Patentanwaltsgesellschaft mbH 
Flüggenstraße 13
80639 München
80639 München (DE)

   


(54) METHOD FOR PREDICTING BANDWITH EXTENSION FREQUENCY BAND SIGNAL, AND DECODING DEVICE


(57) Embodiments of the present invention provide a method for predicting a bandwidth extension frequency band signal, and a decoding device. The method includes: demultiplexing a received bitstream to obtain a frequency domain signal; determining whether a highest frequency bin, to which a bit is allocated, of the frequency domain signal is less than a preset start frequency bin of a bandwidth extension frequency band; when it is less, predicting an excitation signal of the bandwidth extension frequency band according to an excitation signal within a predetermined frequency band range of the frequency domain signal and the preset start frequency bin of the bandwidth extension frequency band; otherwise, predicting the excitation signal of the bandwidth extension frequency band according to the excitation signal within the predetermined frequency band range of the frequency domain signal, the preset start frequency bin of the bandwidth extension frequency band, and the highest frequency bin to which a bit is allocated; and predicting the bandwidth extension frequency band signal according to the predicted excitation signal of the bandwidth extension frequency band and a frequency envelope of the bandwidth extension frequency band. The technical solutions of the embodiments of the present invention can effectively ensure continuity of predicted excitation signals that are of a bandwidth extension frequency band signal and between a former frame and a latter frame, thereby ensuring auditory quality of a restored bandwidth extension frequency band signal.







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